Vivobarefoot - Primus Trail 3.5 FG - Obsidian - Men's Size:EU46 / UK11.5 / US12.5 Designed by runners - no

Designed by runners - no inner thigh seam and super smooth stitching

With four adjustment points across the instep and heel

but not quite as much as the Z-Trek

Unlike flip-flops

Vivobarefoot - Primus Trail 3.5 FG - Obsidian - Men's Size:EU46 / UK11.5 / US12.5 Designed by runners - noHit the trail to rewild yourself and reconnect with nature. The Primus Trail 3. 5 FG is a light, durable, flexible trail running trainer that brings us one step closer to circular footwear. The Primus Trail 3. 5 FG is for runners who live for the end of the road. These all terrain trainers are light and flexible enough to move freely, and tough enough to run wild on rough, rocky ground. Made with recycled, vegan, high performance materials.